Hidden transmission of informational signals by means of modified wavelet transformation

A method is investigated for hidden transmission of informational signals (speech) by means of scrambling on the basis of double transformation: wavelet-mapping modification with H-equivalent matrices. Two algorithm structures for scrambling are given and analyzed. They are specialized for analog and digital channels. The number of keys is determined. The residual information in a scrambled signal is estimated on the basis of two methods (correlation and information-theoretic).